Tire-ventilating device.



D. RAWSTRON.

TIRE VENTILATING DEVICE.

APPLICATION FILED SEPT. 25, 1909.

Patented Oct. 4, 1910.

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A TTORNIi WITNESSES D A'IWENT OFFICE.

DONALD RAWSTRON, OF CHICAGO, ILLINOIS.

TIRE-VENTILATING DEVICE.

Specification of Letters Patent.

Patented Oct. 4, 1910.

Application filed September 25, 1909. Serial No. 519,618.

. Toall whom. it may concern? Be it known that I, DONALD RAws'rRoN, of the city of Chicago, in the State of Illinois, one of the United States of America,

have invented certain new and useful Im-.

provements in Tire-Ventilating Devices, of which the following is a specification.v

llt is well known that pneumatic tires have their lives considerably shortened by the heat generated by friction and my ob ect is to devise means for continuously carrying off this heat as quickly as it is generated, thus preventin the ill results which otherwise would fol ow.

I attain my object by forming within the walls of the tire a large number of air channels communicating at opposite ends with separated annular channels formed in the vided with my improved ventilating devices Fig. 2 is an enlarged longitudinal-sectional detail of part of the tire on, the line aa Fig. 1, showing the fabric forming the air channels between the inner tube and cover. Fig. 3 is an enlarged sectional detail showing connection between the air channels in the tire and the annular channels in the wheel rim.

In'the drawings like letters of reference indicate corresponding parts in the different figures.

A .is the wheel shown partly broken away. The wheel is 'ournaled on the axle B which is of the usual automobile steerin axletype being formed in parts hinged at M invention is of course equally applicab e 'to tires fitted on the rear, wheels of a vehicle.

D is the wheel rim carrying the tire. The tire shown is of ordinary clencher type, being provided with the outer cover. E, engaging the wheel rim in clencher fashion, and the inner tube F. Between the inner and outer tube I form air channels preferably runnin transversely round the tire. These channe s are preferably formed by inserting between the inner tube and the cover a piece of fabric or rubber G corrugated or grooved at one side, as shown particularly in Fig. 2. The material will bestifi enough to mainthe greatest pressure to which the tire is ordinarily subjected. These channels H are 'on the outer side of the fabric .G which is p channels I and J to form a communication therewith.

K and L are pipes leading respectively to 3 the annular channels I and J. They are preferably led down between the spokes of the Wheel and through the hub communicat ing respectively-with'the grooves a and b formed in the plate M secured to the hub.

A similar plate N is carried by the axle B and has grooves formed therein complementary to the grooves a and b. With the grooves in the plate N connect the pipes O and P. These pipes lead res ectively to the outer air and to the suction of an exhaust air pump Q. Each pipe is preferably provided with a swivel joint 0 of ordinary construction in line with the axis on which the parts of the axle swing relative to one another.

The result of this construction is that as long as the air pump Q is running air is drawn in through the pipe 0, asses into the pipe K, thence into theglmnu ar channel 1 around the rim. Thence passing through ,the air channels H into the other annular channel J from whence it passes throu h the pipe'L and pipe P to the pump This constant circulation of cool air willq uickly remove any heat generated in the tire either by road friction or internal friction. Of course I do not desire to restrict myself to the precise means employed by inducing the air circulation through the air channels, and other arrangements than that shown might also be devised by means of which air may be led around every portion of the tire within the walls thereof. I also desire it to be understood that any arrangement which will provide the necessary communications might be. substituted for the pipes K and L.

. What I claim as my invention is 1. The combination of a pneumatic tire havin air channels formed transversely in its wa ls; a wheel rim having separated annular channels formed thereln communicating with opposite ends of the tire channels and one communicating with the outer air; and an air pump with which the other annular channel is connected.

2. The combination of a pneumatic tire comprising an inner tube and a cover and havlng air channels formed between the inner tube and the cover; and means for pumping a current of air through said channels. 1 j 3. The combination of a pneumatic tire comprisingran inner tube and a cover and havmg air channels formedtransverselybetween the inner tube and the cover; and means for passing a current of air through said channels. v

4. The combination of a pneumatic tire com rising an inner tube and a cover and having air channels. formed between the inner tube and the cover; a wheel rim having separated annular channels formed therein communicating with opposite ends of the tire channels and one communicating with the outer air; and an air pump with which the other annular channel is connected.

5. The combination of a pneumatic tire comprising an inner tube and a cover; of an interlining placed between the tube and cover and provided with transverse channels in one face and means for placing opposite ends of the channels in communication with separate air tubes.

6. The combination of a pneumatic tire comprising an inner tube and a cover; of an interlining placed between the tube and cover and provided with transverse channels in one face; a wheel rim having separated annular channels formed therein communicating with opposite ends of the tire channels; and air pipes leading to said annular channels. I

7. The combination of a pneumatic tire having air channels; pipes leading from said channels; a wheel carryin the rim and tireanaxle carrying the whee a plate carried by the wheel rovided with annular grooves to which sai pipes lead; a similar plate carried by the axle; and pipes leading to the grooves of the latter late.

Dated at Toronto, t is 13th day of August DONALD RAWSTRON. v Signed in the resence of J. Enw. YBEE, -F. W. MCKENDRICK. 

